Supply drop

Help!!!

My son is 9 months today and the past week I've been dealing with a drop in my supply. He's EBF and we have been doing so great, I've always produced a lot of milk could get 6-8oz pumped after feeding him but lately I can barely get 4 oz if I'm lucky. Today my son has been really frustrated at the boob so I pumped and gave him a bottle and he seemed happy. Didn't down it all so I don't think he's starving.

I don't know if it's because of stress, I just started watching his cousin who is 1 year and he's a huge handful, always crying and very needy and it's stressing me out.

I've been drinking a lot more water. I'm gonna make some lactation cookies later today when I can get to the store.

I just LOVE breastfeeding and don't want to have to stop now.

Any advice to help me?